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Commit c5f45465 authored Dec 16, 2014 by Seth Jennings Committed by Jiri Kosina Dec 22, 2014

livepatch: kernel: add TAINT_LIVEPATCH



This adds a new taint flag to indicate when the kernel or a kernel
module has been live patched.  This will provide a clean indication in
bug reports that live patching was used.

Additionally, if the crash occurs in a live patched function, the live
patch module will appear beside the patched function in the backtrace.

Signed-off-by: Seth Jennings <sjenning@redhat.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Reviewed-by: Petr Mladek <pmladek@suse.cz>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

parent 97bf6af1

Documentation/oops-tracing.txt

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -270,6 +270,8 @@ characters, each representing a particular tainted value.

	15: 'L' if a soft lockup has previously occurred on the system.		15: 'L' if a soft lockup has previously occurred on the system.

			16: 'K' if the kernel has been live patched.

	The primary reason for the 'Tainted: ' string is to tell kernel		The primary reason for the 'Tainted: ' string is to tell kernel
	debuggers if this is a clean kernel or if anything unusual has		debuggers if this is a clean kernel or if anything unusual has
	occurred. Tainting is permanent: even if an offending module is		occurred. Tainting is permanent: even if an offending module is

Documentation/sysctl/kernel.txt

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -843,6 +843,7 @@ can be ORed together:
	8192 - An unsigned module has been loaded in a kernel supporting module		8192 - An unsigned module has been loaded in a kernel supporting module
	signature.		signature.
	16384 - A soft lockup has previously occurred on the system.		16384 - A soft lockup has previously occurred on the system.
			32768 - The kernel has been live patched.

	==============================================================		==============================================================

include/linux/kernel.h

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -471,6 +471,7 @@ extern enum system_states {
	#define TAINT_OOT_MODULE 12		#define TAINT_OOT_MODULE 12
	#define TAINT_UNSIGNED_MODULE 13		#define TAINT_UNSIGNED_MODULE 13
	#define TAINT_SOFTLOCKUP 14		#define TAINT_SOFTLOCKUP 14
			#define TAINT_LIVEPATCH 15

	extern const char hex_asc[];		extern const char hex_asc[];
	#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]		#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]

kernel/panic.c

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -226,6 +226,7 @@ static const struct tnt tnts[] = {
	{ TAINT_OOT_MODULE, 'O', ' ' },		{ TAINT_OOT_MODULE, 'O', ' ' },
	{ TAINT_UNSIGNED_MODULE, 'E', ' ' },		{ TAINT_UNSIGNED_MODULE, 'E', ' ' },
	{ TAINT_SOFTLOCKUP, 'L', ' ' },		{ TAINT_SOFTLOCKUP, 'L', ' ' },
			{ TAINT_LIVEPATCH, 'K', ' ' },
	};		};

	/**		/**
	@@ -246,6 +247,7 @@ static const struct tnt tnts[] = {
	* 'O' - Out-of-tree module has been loaded.		* 'O' - Out-of-tree module has been loaded.
	* 'E' - Unsigned module has been loaded.		* 'E' - Unsigned module has been loaded.
	* 'L' - A soft lockup has previously occurred.		* 'L' - A soft lockup has previously occurred.
			* 'K' - Kernel has been live patched.
	*		*
	* The string is overwritten by the next call to print_tainted().		* The string is overwritten by the next call to print_tainted().
	*/		*/